EP0189690B1 - Substituted aromatic sulfonamides, their preparation and ophthalmic compositions containing them - Google Patents

Substituted aromatic sulfonamides, their preparation and ophthalmic compositions containing them Download PDF

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Publication number
EP0189690B1
EP0189690B1 EP85402452A EP85402452A EP0189690B1 EP 0189690 B1 EP0189690 B1 EP 0189690B1 EP 85402452 A EP85402452 A EP 85402452A EP 85402452 A EP85402452 A EP 85402452A EP 0189690 B1 EP0189690 B1 EP 0189690B1
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EP
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Prior art keywords
sulfonamide
dihydro
thiopyran
dioxide
solution
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EP85402452A
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German (de)
English (en)
French (fr)
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EP0189690A1 (en
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John J. Baldwin
Gerald S. Ponticello
Marcia E. Christy
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Merck and Co Inc
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Merck and Co Inc
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
    • C07D333/50—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom condensed with carbocyclic rings or ring systems
    • C07D333/52—Benzo[b]thiophenes; Hydrogenated benzo[b]thiophenes
    • C07D333/54—Benzo[b]thiophenes; Hydrogenated benzo[b]thiophenes with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to carbon atoms of the hetero ring
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P27/00—Drugs for disorders of the senses
    • A61P27/02—Ophthalmic agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P27/00—Drugs for disorders of the senses
    • A61P27/02—Ophthalmic agents
    • A61P27/06—Antiglaucoma agents or miotics
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
    • C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
    • C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D307/56—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D307/64—Sulfur atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
    • C07D333/02—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings
    • C07D333/04—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom
    • C07D333/26—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D333/30—Hetero atoms other than halogen
    • C07D333/34—Sulfur atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
    • C07D333/50—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom condensed with carbocyclic rings or ring systems
    • C07D333/52—Benzo[b]thiophenes; Hydrogenated benzo[b]thiophenes
    • C07D333/62—Benzo[b]thiophenes; Hydrogenated benzo[b]thiophenes with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to carbon atoms of the hetero ring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D409/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
    • C07D409/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings
    • C07D409/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D495/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms
    • C07D495/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
    • C07D495/04—Ortho-condensed systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D495/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms
    • C07D495/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
    • C07D495/10—Spiro-condensed systems

Definitions

  • This invention relates to novel aromatic sulfonamides useful in the treatment of elevated intraocular pressure. More particularly this invention relates to compounds having the structural formula: wherein A together with the two carbon atoms denoted as a and is the group: wherein R 1 , R 2 , R 3 , R 4 , X, Y and n are as hereinafter defined, as well as the pharmaceutically and ophthalmologically acceptable salts thereof.
  • This invention also relates to pharmaceutical compositions and the use thereof for systemic and ophthalmic use employing a novel compound of this invention as active ingredient for the treatment of elevated intraocular pressure, especially when accompanied by pathological damage such as in the disease known as glaucoma.
  • Glaucoma is an ocular disorder associated with elevated intraocular pressures which are too high for normal function and may result in irreversible loss of visual function. If untreated, glaucoma may eventually lead to blindness. Ocular hypertension, i. e., the condition of elevated intraocular pressure without optic nerve head damage or characteristic glaucomatous visual field defects, is now believed by many ophthalmologists to represent the earliest phase of glaucoma.
  • carbonic anhydrase inhibitors block or impede this inflow pathway by inhibiting the enzyme, carbonic anhydrase. While such carbonic anhydrase inhibitors are now used to treat intraocular pressure by oral, intravenous or other systemic routes, they thereby have the distinct disadvantage of inhibiting carbonic anhydrase throughout the entire body. Such a gross disruption of a basic enzyme system is justified only during an acute attack of alarmingly elevated intraocular pressure, or when no other agent is effective. Despite the desirability of directing the carbonic anhydrase inhibitor only to the desired ophthalmic target tissue, no topically effective carbonic anhydrase inhibitors are available for clinical use.
  • an ophthalmic carbonic anhydrase inhibitor must not only penetrate the ophthalmic tissues to reach the active sites within the eye, but it must also be devoid of those side effects including irritation, allergic reaction and the like which would militate against long term administration.
  • novel compounds of this invention have structural formula: wherein A together with the two carbon atoms. denoted as a and is the group: or wherein:
  • Y is -S-. It is also preferred that X is -S- or -SO 2 -, n is 1, R 2 is hydrogen, R 3 and R 4 are hydrogen or C 1-5 alkyl and R 1 is -OH, -CH 2 0H or -NR 6 R 7 .
  • the novel process of this invention comprises, as the last step, introduction of the sulfonamide group, which may be followed by removal of protecting groups from labile substituents, oxidations or reductions depending on the end product desired.
  • Introduction of the sulfonamide group comprises the steps of:
  • An alternate procedure for interoduction of the sulfonamide group comprises the steps of:
  • protective groups are generally labile ethers such as a 2-methoxyethoxymethyl ether or dihydropy- ranyl ether of an alcohol, or ketals especially an ethylene ketal of an oxo group and are readily removed by treatment with acid in a partially aqueous medium such as a dilute mineral acid such as sulfuric or hydrochloric acid at about 15 to 100°C for about 5 to 60 minutes.
  • a partially aqueous medium such as a dilute mineral acid such as sulfuric or hydrochloric acid at about 15 to 100°C for about 5 to 60 minutes.
  • hydroxy group may be oxidized to oxo groups with Jones reagent (CrO 3 /H 2 SO 4 ) or manganese dioxide in chloroform.
  • Oxo groups may be reduced with a complex metal hydride, such as sodium borohydride.
  • Thio groups may be oxidized to the sulfoxide with sodium metaperiodate and to the sulfone with Oxone R (potassium peroxymonosulfate, 2KHS0 5 .KHS0 4 .K 2 S0 4 ) or m-chloroperbenzoic acid or the like.
  • novel pharmaceutical formulations of this invention are adapted for oral administration such as tablets, capsules or the like; for nasal administration, especially in the form of a spray; for injection, in the form of a sterile injectable liquid; of for topical ocular administration in the form of solutions, ointments or solid water soluble polymeric inserts.
  • This invention is particularly concerned with formulations adapted for topical ocular administration for the treatment of glaucoma and other stages of elevated intraocular pressure and contain about 0.1 % to 15% by weight of medicament, especially about 0.5 to 2% by weight of medicament, the remainder being comprised of carriers and other excipients well known in the art.
  • the medicament in the novel topical ocular formulations comprises one of the novel compounds of this invention either alone or in combination with a ⁇ -adrenergic blocking agent such as timolol maleate or a parasympathomimetic agent such as pilocarpine. In such combinations the two active agents are present in approximately equal amounts.
  • the novel method of treatment using the compounds of this invention comprises the treatment of elevated intraocular pressure by the administration of a novel compound of this invention or a pharmaceutical formulation thereof.
  • a novel compound of this invention or a pharmaceutical formulation thereof Of primary concern is the treatment by topical ocular administration of about 0.1 to 25 mg and especially 0.2 to 10 mg of such compound per day, either by single dose or on a 2 to 4 dose per day regimen.
  • Step B Preparation of 5,6-dihydro-4H-4-(2-methoxyethoxymethoxy)thieno[2,3-b]thiopyran-2-sulfonamide
  • Step C Preparation of 5,6-dihydro-4H-4-(2-methoxyethoxymethoxy)thieno[2,3-b]thiopyran-2-sulfonamide-7,7-dioxide
  • Step D Preparation of 5,6-dihydro-4H-4-hydroxy- thieno[2,3-b]thiopyran-2-sulfonamide-7,7-dioxide
  • Step A Preparation of 5,6-dihydro-4H-4-oxo- thieno[2,3-b]thiopyran ethylene ketal
  • Step B Preparation of 5,6-dihydro-4H-4-oxo- thieno[2,3-b]thiopyran-2-sulfonamide
  • Step B there was prepared the title compound from 26.2 g (0.12 mol) of product from Step A of this Example 2 except the crude ketal after the ammonia treatment was hydrolyzed in 3 N HCI and acetone by heating on a steam bath for 0.5 hour. After evaporation of the acetone, che aqueous phase was extracted with ethyl acetate (3x). The organic extracts were dried, filtered and concentrated to dryness. The residue was chromatographed on silica gel and eluted with 40-50 % ethyl acetate/hexane to yield 1.45g g (5%) of product from CH 3 CN, m. p. 222-223°C.
  • Step A Preparation of 6,7-dihydro-5H-7-oxo- thieno[3,2-b]thiopyran ethylene ketal
  • Step B Preparation of 6,7-dihydro-5H-7-oxo- thieno[3,2-b]thiopyran-2-sulfonamide
  • Step C Preparation of 5,6-dihydro-4H-5-(2-methoxyethoxymethoxy)thieno[2,3-b]thiopyran-2-sulfonamide
  • Step D Preparation of 5,6-dihydro-4H-5-hydroxy- thieno[2,3-b]thiopyran-2-sulfonamide-7,7-dioxide
  • a solution of product from Step C (8.0g, 0.0225mol) in CH 3 0H (150ml) was added with stirring at room temperature a solution of OXONE R (18g, 0.029mol) in H 2 0 (150ml). After 2 days, the suspension was filtered and the solid washed with CH 3 0H. The CH 3 0H was evaporated from the filtrate and the aqueous layer was extracted with ethyl acetate (3x). The organic extracts were dried, filtered and concentrated to dryness to yield 8.6 g of crude product.
  • the organic extracts were dried, filtered and concentrated to dryness.
  • the residue was dry packed, and chromatographed on silica gel and the product eluted with 20% CH 3 0H/CHCI 3 (v/v) to yield 1.8g of product.
  • the solid was converted to the HCI salt with HCI-ethanol and the product was crystallized from CH 3 CN to yield 2.0 g (40 %) as the HCI salt of the product; m. p. 254-256 °C.
  • the free base has m. p. 155-156 °C.
  • Step C Preparation of 6,7-dihydro-5H-6-(2-methoxyethoxymethoxy)-7H-thieno[3,2-b]-thio- pyran-2-sulfonamide
  • Step B The product from Step B (9.2 g mmol) was sul- famoylated by the procedure described in Example 1, Step B.
  • the crude product (2.75) g) was obtained in 88% yield as a brown oil that was purified by chromatography on silica gel (150g). Elution with 50 ethyl acetate/50 hexane (v/v) gave 2.08 (67%) of product as a pale yellow oil that was characterized by nmr.
  • Step D Preparation of 6,7-dihydro-5H-6-hydroxy- thieno[3,2-b]thiopyran-2-sulfonamide-4,4-dioxide
  • Step A Preparation of 8-Hydroxy-5,6,7,8-tetrahyd- rothieno[3,2-b]thiepin
  • Step B Preparation of 8-(2-methoxyethoxy- methoxy)-5,6,7,8 tetrahydrothieno[3,2-b]-thiepin
  • Step C Preparation of 8-(2-methoxyethoxy- methoxy)-5,6,7,8-tetrahydrothieno[3,2-b]-thiepin-2-sulfonamide
  • the mixture was concentrated under reduced pressure below 50°C and the residue was dissolved in methylene chloride (210ml), cooled to 0°C, and stirred while N-chlorosuccinimide (10.95g, 0.082m) was added over 20 minutes. After stirring at ambient temperature for 2 hours, the mixture was filtered and the filtrate was concentrated under reduced pressure below 50°C.
  • the oily residue was dissolved in acetone (210 ml), the solution was cooled to 0°C and concentrated ammonium hydroxide (105 ml) was added over 10 minutes. After stirring at ambient temperature for 30 minutes, the solvent was evaporated under reduced pressure.
  • Step D 8-(2-methoxyethoxymethoxy)-5,6,7,8-tet- rahydrothieno[3,2-b]-thiepin.2-sulfonamide-4,4-dioxide
  • Step A Preparation of 4,5,6,7-tetrahydro-4-oxo- thieno-[2,3-b]thiepin
  • Step B Preparation of 4-oxo-4,5,6,7-tetrahydro- thieno.[2,3-b]thiepin-2-sulfonamide
  • Acetic anhydride (39.82 g, 0.39 mole) was added to a solution of 4-oxo-4,5,6,7-tetrahydro- thieno[2,3-b]thiepin (24.65g, 0.13 mole) in ethyl acetate (250 ml) and the mixture was cooled in an ice bath while a solution of concentrated sulfuric acid (13.73g, 0.14m) in ethyl acetate (66ml) was added over 20 minutes. The mixture was stirred at ambient temperature for 2 hours, then cooled in an ice bath while a solution of potassium acetate (13.74g, 0.14mole) in 95% ethanol (81 ml) was added over 20 minutes. After stirring at ambient temperature for 1 hour, the solid was collected and dried to yield 34.13g (87%) of potassium 4,5,6,7-tetrahydrothieno[2,3-b]thiepin-4-oxo-2-sulfonate.
  • Step C Preparation of 4-oxo-4,5,6,7-tetrahydro- thieno[2,3-b]thiepin-2-sulfonamide-8,8-dioxide
  • Step D Preparation of 4-hydroxy-4,5,6,7-tetrahyd- rothieno-[2,3-b]thiepin-2-sulfonamide-8,8-dioxide
  • the mixture was stirred at 70°C for 2 hours, then an additional 0.15 g (0.004 mole) of sodium borohydride dissolved in ethanol (10 ml) was added over 10 minutes. After stirring at 70°C for 2 hours more and then at ambient temperature for 15 hours, water (50 ml) was added.
  • the mixture was acidified by the dropwise addition of 6 N hydrochloric acid (5 ml) and the ethanol was evaporated under reduced pressure.
  • the aqueous suspension was extracted with ethyl acetate (100ml and 2 x 75 ml), the combined extracts were washed with saturated sodium bicarbonate solution, twice with water, dried over sodium sulfate and evaporated under reduced pressure to yield 2.37 g (94%) of product. Further purification was effected by chromatography on silica gel, eluting with 10% methanol-chloroform (v/v).
  • Step A Preparation of (S,R) and (R,R)-5,6-dihydro-4-[2-methoxy-2-phenylacetoxy]thieno[2,3-b]thio- pyran-2-sulfonamide-7,7-dioxide
  • Step B Preparation of (R)-5,6-dihydro-4H-4-hyd- roxythieno[2,3-b]thiopyran-2-sulfonamide-7,7-dioxide
  • the (R,R)-diastereomer (6.0g, 13.9mmol) was stirred in 0.2 N NaOH (290 ml) for 1 hour.
  • the pH of the solution was adjusted to 7.0 with 3 N HCI and extracted with ethyl acetate (3 x 300 ml). The extracts were combined and the solvent was removed in vacuo.
  • the crude product was crystallized from 15 ml of hot CH 3 CN yielding 3.1 g (79%) of product, m. p. 170-171 °C.
  • Step C Preparation of (S)-5,6-dihydro-4H-4-hyd- roxythieno[2,3-b]thiopyran-2-sulfonamide 7,7-dioxide
  • the (S)-isomer was prepared in an analogous manner from the (S,R)-diastereomer: m. p. 170-71 °C.
  • Step A Preparation of 4-hydroxy-4,5,6,7-tetrahyd- robenzo[b]thiophene
  • Step B Preparation of 4-tetrahydropyranyloxy-4,5,6,7-tetrahydrobenzo[b]thiophene
  • the sulfinate was suspended in 35ml CH 2 CI 2 and 2.68g (0.020mol) N-chlorosuccinimide was added at 0°C. After 2 hours the succinimide byproduct was removed by filtration. The filtrate was concentrated under reduced pressure yielding 4.79 g (0.014 mol) of the sulfonyl chloride whose existence was confirmed by NMR. This material was dissolved in 26 ml acetone and 13 ml concentrated NH 4 0H was added at 0°C. After 15 minutes the ice bath was removed and after an additional 30 minutes the solvents were removed under reduced pressure. After 2 hours under high vacuum the yield of product was 5.96 g (40 %).
  • Step D Preparation of 4-hydroxy-4,5,6,7-tetrahyd- robenzo[b]-thiophene-2-sulfonamide
  • Step A Preparation of 5-oxo-4,5,6,7-tetrahyd- robenzo[b]thiophene ethylene ketal
  • Step B Preparation of 5-oxo-4,5,6,7-tetrahyd- robenzo[b]thiophene-2-sulfonamide ethylene ketal
  • Step C Preparation of 5-oxo-4,5,6,7-tetrahyd- robenzo[b]thiophene-2-sulfonamide
  • the product was purified by chromatography on silica gel, eluting with methylene chloride, to give 0.57 g (20 %) of pure product.
  • N-Butyl lithium (180g, 2.81 mol) in hexane (1.6M solution) was added to a solution of thiophene (200 ml, 2.5 mol) in 1500 ml ether under N 2 while keeping the temperature between 25-30°C.
  • the mixture was stirred at room temperature for 1 hour then heated at reflux for 2 hours, cooled to -60°C and sulfur (80.15g, 2.5 mol) added.
  • the mixture was stirred at -60 ° to -70°C for 45 minutes, allowed to warm to -10°C then cooled to -20°C and H 2 0 (500 ml) added slowly.
  • the layers were separated and the aqueous layer added to a solution of 3-bromopropionic acid (382.5g, 2.5mol) in 250ml H 2 O which was neutralized by the addition of K 2 C0 3 (172.8g, 1.25 mol) prior to the addition of the thiophenethiol.
  • the organic layer was washed with H 2 0 (500 ml and 100ml) and the aqueous washes were added to the solution of the 3-bromopropionic acid (slight exotherm).
  • the reaction mixture was stirred at room temperature for 18 hours then heated on the steam bath for 1 hour. After cooling to room temperature the mixture was extracted with ether (2 x 250 ml), cooled in an ice bath and acidified to pH 1.0 with 6NHCI.
  • Step B Preparation of 5,6-Dihydro-4H-oxo- thieno[2,3-b]thiopyran
  • Step C Preparation of 5,6-Dihydro-4H-4-oxo- thieno[2,3-b]thiopyran-2-sulfonic acid
  • Step D Preparation of 5,6-Dihydro-4H-4-oxo- thieno[2,3-b]thiopyran-2-sulfonyl chloride
  • Step E Preparation of 5,6-Dihydro-4H-4-oxo- thieno[2,3-b]thiopyran-2-sulfonamide
  • Step F Preparation of 5,6-Dihydro-4H-4-hydroxy- thieno[2,3-b]thiopyran-2-sulfonamide
  • Step G Preparation of 5,6-Dihydro-4H-4-hydroxy- thieno[2,3-b]thiopyran-2-sulfonamide-7,7-dioxide
  • the layers were separated and the aqueous layer was added to a solution of ⁇ -chloropivalic acid (50.00 g, 0.366m) in potassium carbonate (25.29 g, 0.183m) dissolved in water (70 ml).
  • the ether layer was washed with 75 ml and 25 ml of water and the washings were added to the pivalic acid solution and stirred at ambient temperature under nitrogen for about 17 hours.
  • the mixture was heated on a steam bath for 1 hour, cooled and washed with ether (2 x 75 ml).
  • the aqueous solution was acidified with 6 N hydrochloric acid and extracted with ether (3 x 100 ml). After washing with water and drying over sodium sulfate, the solvent was evaporated in vacuo. The residue was distilled to give 59.13g g (75%) of product boiling at 145-151°C/0.5mm Hg.
  • Acetic anhydride (30.63 g, 0.30 m) was added to a solution of 5,6-dihydro-5,5-dimethyl-4H-thieno[2,3-b]thiopyran-4-one (19.84g, 0.10m) in methylene chloride (160 ml) with stirring at -8°C. With continued ice-bath cooling, concentrated sulfuric acid (10.8g, 0.11 m) was added dropwise over 10 minutes while maintaining the temperature below 10°C. The mixture was stirred at ambient temperature for 1.5 hours, then a solution of potassium acetate (10.8g, 0.11 m) in 95% ethanol (65 ml) was added over 10 minutes with occasional cooling to keep the temperature at 20-25°C.
  • the aqueous suspension was distributed between ethyl acetate (300 ml) and water (200 ml), the aqueous layer was separated and extracted with ethyl acetate (2 x 300 ml), the combined ethyl acetate layers were washed with saturated sodium bicarbonate solution, twice with water and dried over sodium sulfate. The solvent was evaporated under reduced pressure to yield 11.71 g (91 %) of product.
  • An analytical sample melted at 158-159°C after recrystallization from nitromethane.
  • a solution of Jones reagent was prepared by dissolving 26.72 g of chromic trioxide in 23 ml of concentrated sulfuric acid and diluting with water to a volume of 100 mi.
  • N-tert-butoxycarbonyl-glycine (3.68g, 0.021 mole) and 5,6-dihydro-4H-4-hydrox- ythieno[2,3-blthiopyran-2-sulfonamide-7,7-dioxide (5.6 g, 0.02 mole) were dissolved in 100 ml of dry tetrahydrofuran.
  • the acylation catalyst 4-dimethylaminopyridine (0.24 g, 0.002 mole) was added and the mixture was cooled to 0°C (under nitrogen).
  • the tert-butoxycarbonylglycyloxy compound from Example 41 (4.4g, 0.01 mole) was stirred with 150 ml of ethyl acetate, resulting in a slightly turbid solution. This was clarified by filtration to give 40 mg of insoluble material. Initially, one equivalent (2.08ml) of 4.82 N HCI/ethyl acetate was added. This gave no precipitate after 2 hours, so an extra amount (20.8 ml) was added and stirring continued overnight. A white solid was deposited on the sides of the flasks. This was collected and washed with ether to give 2.87 g of material.
  • Step D Preparation of 5,6-Dihydro-4H-4-(2-methoxyethoxymethoxy)methylthieno[2,3-b]thio- pyran
  • Step E Preparation of 5,6-Dihydro-4H-4-(2-methoxyethoxymethoxy)methylthieno[2,3-b]thio- pyran-2-sulfonamide
  • Step F Preparation of 5,6-Dihydro-4H-4-(2-methoxyethoxymethoxy)methylthieno[2,3-b]thio- pyran-2-sulfonamide-7,7-dioxide
  • Step G Preparation of 5,6-Dihydro-4H-4-hydroxy- methylthieno[2,3-b]thiopyran-2-sulfonamide-7,7-dioxide
  • Step A Preparation of 4-(N-Ethyl-N-acetylamino)-5,6-dihydro-4H-thieno[2,3-b]thiopyran-2-sulfonamide-7,7-dioxide
  • Step B Preparation of 4-(N,N-diethylamino)-5,6-dihydro-4H-thieno[2,3-b]thiopyran-2-sulfonamide-7,7-dioxide
  • Step A Preparation of 5,6-Dihydro-4-[2-(acetamido)ethoxy]thieno[2,3-b]-thiopyran-2-sulfonamide
  • Step B Preparation of 5,6-Dihydro-4-[2-(acetamido)ethoxy]thieno[2,3-b]-thiopyran-2-sulfonamide-7,7-dioxide
  • Step C Preparation of 5,6-Dihydro-4-[2-(ethyl- amino)ethoxy]thieno[2,3-b]-thiopyran-2-sulfonamide-7,7-dioxide
  • the residual oily product was chromatographed on a column of silica gel, the product being eluted with 80 chloroform: 20 methanol: 2 conc. NH 4 0H (v/v/v). Evaporation of the eluant left the product as a colorless glass that was dried at 46°C under high vacuum for 20 hours; 1.2 g (63%).
  • the product was converted to the hydrogen oxalate salt by treatment of a solution in absolute ethanol (12 ml) with a solution of oxalic acid (1 equiv.) in ether (25ml), yield, 1.2 g, m. p. dec. 219-221 °C.
  • Step A Preparation of 5,6-Dihydro-4-isobutyryl- amino-4H-thieno[2,3-b]thiopyran-2-sulfonamide-7,7-dioxide
  • Step B Preparation of 5,6-Dihydro-4-isobutyl- amino-4H-thieno[2,3-b]thiopyran-2-sulfonamide-7,7-dioxide hydrochloride
  • the novel compound, phosphate buffer salts, and benzalkonium chloride are added to and dissolved in water.
  • the pH of the composition is adjusted to 6.8 and diluted to volume.
  • the composition is rendered sterile by ionizing radiation.
  • the compound and the pet olatum are aseptically combinded.
  • Ophthalmic inserts are manufactured from compression molded films which are prepared on a Carver Press by subjecting the powdered mixture of the above ingredients to a compressional force of 12,000 Ibs. (gauge) at 300 °F for one to four minutes. The film is cooled under pressure by having cold water circulate in the platen. Ophthalmic inserts are then individually cut from the film with a rod-shaped punch. Each insert is placed into a vial, which is then placed in a humidity cabinet (88% R.H. at 30°C) for two to four days. After removal from the humidity cabinet, the vials are stoppered and then capped. The vials containing the hydrate insert are then autoclaved at 250 °F for 1 ⁇ 2 hour.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Plural Heterocyclic Compounds (AREA)
  • Indole Compounds (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Medicinal Preparation (AREA)
EP85402452A 1984-12-12 1985-12-10 Substituted aromatic sulfonamides, their preparation and ophthalmic compositions containing them Expired EP0189690B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85402452T ATE41002T1 (de) 1984-12-12 1985-12-10 Substituierte aromatische sulfonamide, ihre herstellung und diese enthaltende ophthalmische zubereitungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US68068484A 1984-12-12 1984-12-12
US680684 1984-12-12

Publications (2)

Publication Number Publication Date
EP0189690A1 EP0189690A1 (en) 1986-08-06
EP0189690B1 true EP0189690B1 (en) 1989-03-01

Family

ID=24732085

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85402452A Expired EP0189690B1 (en) 1984-12-12 1985-12-10 Substituted aromatic sulfonamides, their preparation and ophthalmic compositions containing them

Country Status (8)

Country Link
EP (1) EP0189690B1 (ja)
JP (1) JPS61158978A (ja)
AT (1) ATE41002T1 (ja)
CA (1) CA1286294C (ja)
DE (1) DE3568431D1 (ja)
DK (1) DK167874B1 (ja)
ES (1) ES8704498A1 (ja)
IE (1) IE59139B1 (ja)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4863922A (en) * 1984-12-12 1989-09-05 Merck & Co., Inc. Substituted aromatic sulfonamides as antiglaucoma agents, compositions and use
US4894390A (en) * 1987-08-03 1990-01-16 Merck & Co., Inc. Substituted thieno[2,3-b]thiophene-2-sulfonamides as antiglaucoma agents
EP0309028A3 (en) * 1987-09-16 1990-06-27 Merck & Co. Inc. Substituted thieno(2,3-b)furan-2-sulfonamides as antiglaucoma agents
US4876271A (en) * 1988-12-20 1989-10-24 Merck & Co., Inc. Substituted thieno[3,2-b]thiophene-2-sulfonamides as topically active carbonic anhydrase inhibitors
US5045561A (en) * 1990-04-12 1991-09-03 Merck & Co., Inc. Substituted furan sulfonamides as antiglaucoma agents
CA2080403A1 (en) * 1991-10-15 1993-04-16 John J. Baldwin Tricyclic thienothiopyrans
WO1993016701A2 (en) * 1992-02-21 1993-09-02 Alcon Laboratories, Inc. Topical antiglaucoma compositions comprising carbonic anhydrase inhibitors and beta-blockers
GB9716657D0 (en) 1997-08-07 1997-10-15 Zeneca Ltd Chemical compounds
GB9803226D0 (en) 1998-02-17 1998-04-08 Zeneca Ltd Chemical compounds
GB9902455D0 (en) 1999-02-05 1999-03-24 Zeneca Ltd Chemical compounds
GB9902459D0 (en) 1999-02-05 1999-03-24 Zeneca Ltd Chemical compounds
GB9902453D0 (en) 1999-02-05 1999-03-24 Zeneca Ltd Chemical compounds
GB9902452D0 (en) 1999-02-05 1999-03-24 Zeneca Ltd Chemical compounds
GB9902461D0 (en) 1999-02-05 1999-03-24 Zeneca Ltd Chemical compounds
TWI290470B (en) * 1999-12-01 2007-12-01 Sankyo Co The composition for treating glaucoma
GB0000625D0 (en) 2000-01-13 2000-03-01 Zeneca Ltd Chemical compounds
EP2152718A2 (en) * 2007-05-07 2010-02-17 Cipla Limited Process for preparing dorzolamide

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4386098A (en) * 1981-11-03 1983-05-31 Merck & Co., Inc. 6-Hydroxy-2-benzothiazolesulfonamide for the topical treatment of elevated intraocular pressure
US4477466A (en) * 1983-05-23 1984-10-16 Merck & Co., Inc. Acyloxy derivatives of [phenylsulfonyl(or sulfinyl)]thiophenesulfonamide for the topical treatment of elevated intraocular pressure
IL72070A (en) * 1983-06-20 1988-11-30 Merck & Co Inc 2-sulfamoylbenzo(b)-thiophene derivatives,their preparation and pharmaceutical compositions containing them
US4486444A (en) * 1983-06-20 1984-12-04 Merck & Co., Inc. (Hydroxybenzoyl)thiophenesulfonamide and acyl derivatives thereof for the topical treatment of elevated intraocular pressure
US4544667A (en) * 1984-02-09 1985-10-01 Merck & Co., Inc. 2-Sulfamoylbenzo[b]furan derivatives for the treatment of elevated intraocular pressure
DE3576498D1 (de) * 1984-03-14 1990-04-19 Merck & Co Inc 2-sulfamoyl-1h-indole-derivate zur behandlung von hohem intraocularem druck.

Also Published As

Publication number Publication date
DK572085D0 (da) 1985-12-11
IE59139B1 (en) 1994-01-12
DK167874B1 (da) 1993-12-27
DE3568431D1 (en) 1989-04-06
JPH0533709B2 (ja) 1993-05-20
IE853143L (en) 1986-06-12
ES8704498A1 (es) 1987-04-01
ATE41002T1 (de) 1989-03-15
JPS61158978A (ja) 1986-07-18
EP0189690A1 (en) 1986-08-06
DK572085A (da) 1986-06-18
CA1286294C (en) 1991-07-16
ES549833A0 (es) 1987-04-01

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